About: http://webisa.webdatacommons.org/73982203

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	M is a cation chosen from the group consisting of: Na+, K+, Mg++, Ca++, Zn++, NH4 +, alkylammonium, dialkylammonium, trialkylammonium and tetraalkylammonium;
http://www.w3.org/ns/prov#wasQuotedFrom	google.com